Ai Weiwei says: 'Posters of the Door Gods are traditionally placed at the entrance to every Chinese ­family's home to protect them from evil spirits. This includes ­details from art works I have made, such as Sunflower Seeds and ­Watermelon; and internet ­memes such as Caonima [the red-nosed llamas in the foreground, and the title of
Ai's Gangnam Style parody]. The caonimas represent the spirit of defiance against internet censorship in China. Each Chinese New Year, I ­create a different poster of the gods for ­netizens to download and post on their doors. I would like to share this with Guardian readers'

Hockney says: 'This is the fifth drawing from a series of works on my cut-down "totem" – the tree stump outside Bridlington which was cut down in the night last month: a ­deliberate act of vandalism. The only festive thing about it is the snow'

Susan Hiller says: 'My screensaver is for the enjoyment of believers who can see eternity in a grain of sand, heaven in a wild flower and Jesus in a slice of burned toast. It's also for the ­pleasure of non-believers who appreciate ­visual paradoxes'